SEGESTRELLA. 



301 



quently hemispherical or globose, its base more or less immersed 

 in thallus. PeritJiecwm (proper exciple) closed, generally carbo- 

 naceous, ostiolate, never necked. Thalamium gelatinous, sub- 

 hyalline, diffluent. 



The members of this family from their appearance are 

 called ' Wart worts' (verrttca, a wart), and are besprinkled 

 over the surface of rocks or the bark of trees as small, black 

 or dark-coloured, globular warts."* 



Genus I. SEGESTRELLA, Fries. 



Gen. Char. Perithecium solitary, waxy-membranaceous, co- 

 loured (reddish or brownish) ; ostiole simple, subpapillate. 



1. Segestrella thelostoma. Thallus subtartareous, 

 pale greyish-brown, contiguous, effuse. Apothecia largish, 

 reddish-brown, apex alone projecting from the conical, thai- 

 line tubercles. Spores ellipsoid, margined, pale yellow. (E. 

 B. 2153.) 



On quartzose shady rocks in lowland and subalpine re- 

 gions, but rare : a somewhat anomalous and doubtfully dis- 

 tinct genus and species. 



* Duby, Botanicon Gall., vol. ii. : Flotow, Bot. Zeitung, vol. viii., 1850 : 

 Florke, Magaz. f. d. Neuest. Eutdeck. in d. Naturk., 1807. 



